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Old 01-18-2011, 10:39 AM   #1
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Heil heat pump not working


Thought I posted this yesterday but could not find it. If so sorry for the dbl post.
I have an 8 year old Heil 5 ton Heat pump. I replaced the fan blower motor two years ago and the condenser fan motor this past year. All capacitors were replaced when the motors were. The compressor will not come on. The outside condenser fan will not run. The inside fan operates normally and blows air thru the house. Thermostat is a Honeywell deluxe programable (also 8 yrs old) and appears to be operating normally. When operated in the heat mode, thermostat is calling for aux heat. Aux heat strips are not being energized. I believe this may have been happening for several weeks although I did not make the connection until this weekend when the fan stopped working.

Power is reaching the contactor and when manually pushed in to make contact, the compressor and outside fan operate.

Update: Checked for 24 volts low side of contactor. 24 volts - good. Placed jumper wire from low voltage side of contactor to Y1 on low voltage Thermostat bus. After timed delay, compressor and fan came on. Doesn't that indicate a Defrost board pbm?

There appears to be no obvious burned out part. Transformer and Sequencer appear normal. Defrost control circuit card appears normal with no burned spots. There is no burned wire or other smell.

Any idea what might be wrong? My first thought is to suspect the Contactor as the system works when it is manually operated. However I am not sure that is all there is to the issue. Help please.

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Old 01-18-2011, 05:01 PM   #2
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Heil heat pump not working


I don't know if this will help, but I have learned this year that- there is a burnout prevention circuit built in. The heat strips will not be energized if the correlating fan is not running.

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Old 01-18-2011, 05:54 PM   #3
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Heil heat pump not working


does the stat say aux heat on? if you switch to emergency heat do the strips work?
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Old 01-21-2011, 01:17 PM   #4
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Heil heat pump not working


Aux heat strips do not come on.

Repairman friend said two most obvious pbms would be Defrost bd and loss of freon. Defrost bd went bad 4 years ago and was replaced so I have again replaced Defrost Bd as this was the first obvious problem. Comp and condenser fan still do not work. Repairman says the nest pbm will be loss of freon which triggers pressure sensor and shuts down comp. Need reairman for that and haven't called for him yet.

Any other items I need to ck.
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Old 01-21-2011, 05:01 PM   #5
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Heil heat pump not working


if aux strips dont come on with emergency heat then there is another issue
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Old 01-21-2011, 05:17 PM   #6
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Heil heat pump not working


Check the the pressure switches to see if they are open or closed.

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